Hydraulic means for compressing gases.



K. GAULDIE.

HYDRAULIC MEANS FOR vCUMPRIE'SSING GASES. APPLICATION mm MAY l. 1915` Patented Aug. 14, 1917.

f 5lr r r r r r r z r l r r f g l KENNETH GaULDI-E, or GLASGOW, ,seo'rnaivn HYDRAULIC MEANSIOR COMPRESSI'NG GASES.

SeeeeeoeofLeerseene Patented aug-,14, 1era Application led Mey l., 1915. Serial N0.' 35,323.

lstream or streams of the entraining liquid is not of materially increasingv value in the direction of motion of the liquid.

According to the present invention, the entraining liquid is distributed 'over the cross section of a mixing. chamber at one end of which all the gas to be compressed enters, the said chamber consisting of a channel, the length of which is at least eight times its mean diameter and the cross sectional area of which does not increase in the direction of flow, and may be even smaller at the discharge end than at the inlet end. It has been found that when the ratio of the length of the mixing tube to its mean diameter is less than eight, the efficiency of the ejector is low but beyond this ratio the efliciency rapidly increases. An expanding channel may be added at the discharge end of the mixing chamber, but when the entraining water passes through the air space at a high velocity suflicient for self-ejection without the use of an expanding channel there is no advantage gained by this expedient which would, therefore, usually be omitted.

In most ejectors the rise in pressure taking place in the ejection channel is due partly to a quick rise of pressure resulting fromthe shock caused by the sudden change in velocity of the water in the region where it coalesces with its entrained air into a more or less homogeneous emulsion capable of exerting a static pressure against the walls of the ejection passage, and partly to the rise in pressure taking place in the expanding channel after the shock has taken place. In those modifications-of the invention in which no expanding passage is used, the whole rise in pressure takes place at the shock Zone.

In the accompanying drawings, Figure 1 is a longitudinal section of a hydraulic ejec-k tor embodying the principle of the invention, Fie. .2 being e Similar view of e Slghti i meded Constr-aaien.,

Ae therein Shawn, Parallel jete 0f veter from a neet. ef nozzles, A; ere directed through the air epeee H and down the ione parallel mixing telle D,4 the dieeheree end of whichk is eubmereed. inv liquid. ltfie preetieelly impossible te insure ebeelute Parallelism-0f e, large. ,number 0f ieteend eoneequently eemeef the Water ie eeusht en thewelle ef the tube Where mueh 0f the energy is dissipated, 'lhe position of the eheek' Zeile. depende ner-tlv en these friction losses and is in consequence not absolutely determinate, but ee fev ee peeeible it Should lee eleee te .the deeharge end of the ,tube D, and when an expanding exteneen te this tube ie. mended, the expanden Should preferablybe', 'te begin inet below the pointl at which the shock takesy place.

. It may, vin vcertaine circumstances., be an advantage that the mixing tube should have longitudinally parallel sides throughout a portion of its length, preferably the major portion, but have a contracting outlet part as indicated at E in Fig. 2.

Instead of subdividing the entraining water into jets as above described, any other method of subdivision may be adopted which does not cause the water to spread over an increasing area inits forward movement. For'example, the water may be subdivided in the known manner by impinging jets which produce one or more fan-shaped sheets of water or spray. In this case the mixing passage should conform in cross section with the shape of such sheet or sheets while maintaining an approximately constant area, z'. e., it should contract in one plane while expanding in the other.

The invention has been described with particular reference to air pumps for compressing air from condenser pressure to atmospheric pressure, but with suitable modifications it is equally applicable to compressing gases between any pressure limits. When the higher pressure oliiers from atmospheric pressure the sealing tank into which the ejector discharges its mixture of air and water must be in a closed'vessel.

I-Iaving thus described my invention and the best means I know of carrying the same into practical effect, I claim l `1. A hydraulic device for ejecting and 'compressing' gases comprisingV a mixing chamber consisting of a tube the cross secthe tube by which the entrainingwater andv the Whole of the entrained gases enter the tube and means by which the jets of entraining Water move in directions substantially parallel to the Walls of the tube.

2.' A hydraulic device for ejecting and compressing gases, comprising a mixing chamber consisting of a tube the cross section of Which does not increase in the direction of motion of the liquid, the length of the tube being at least eight times its mean diameter, compartments at the upper end of the tube by which the entraining Water and the Whole of the entrained gases enter the tube and a nest of nozzles from Which the entraining jets are distributed over the crosssection of the mixing tube and move in directions substantially parallel to the Walls of the tube. p

3. A hydraulic device for ejecting and compressing gases, comprising a mixing chamber consisting of a tube the cross-section of which does not increase in the direction of motion of the liquid, the length of the tube being at least eight times its mean diameter, compartments at-the upper end of the tube by Which the entraining Water and the Whole of the entrained gases enter the tube, and means by Which the entraining Water Vcoalesces With the entrained air at pokints adjacent to the discharge end of the tu e.

4E. A hydraulic device f or ejecting and compressing gases, comprising a mixing chamber consisting of tube the greater portion of which is of constant cross-section but the final portion of Which is of decreasing area, the length oi the tube being at least eight times its@ mean diameter, compartments at the upper end of the tube by which the entraining water and the Whole of the entrained gases enter the tube andmeans by which the jets of entraining Water move in directions ksubstanti ally parallel to the Walls of the tube.

'In testimony Whereoi'l have signed my name to this specification in the presence of two subscribing Witnesses.

KENNETH GAULDIE,"

Vitnesses z rli-ros. HALL, G. F. BiioDni.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, ID. C. Y 

